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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-3214) Ability to mlock certain fields from the terms dict
Date Sat, 18 Jun 2011 16:25:47 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-3214?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael McCandless updated LUCENE-3214:
---------------------------------------

    Attachment: LUCENE-3214.patch

Prototype hacked up but working patch.

> Ability to mlock certain fields from the terms dict
> ---------------------------------------------------
>
>                 Key: LUCENE-3214
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3214
>             Project: Lucene - Java
>          Issue Type: Improvement
>            Reporter: Michael McCandless
>         Attachments: LUCENE-3214.patch
>
>
> This is a hacked up prototype!  It works but I'm not sure how to get this to a committable
point.
> The patch invokes mlock() (tested only on Linux), locking pages from the terms dictionary
file that hold terms for a specified field.  You can only do this with MMapDirectory.
> I used this to lock pages for the "id" field in the NRT stress test; it's an alternative
to MemoryCodec.  But, it requires you set up the OS to allow the app/user to lock pages in
RAM.
> It works very well in reducing the NRT reopen latency even when large merges are running...

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